.login-content{
    width: 100%;
    height: calc(100%-40);
    display: flex;
    align-items: center;
    justify-content: center;
}
.login-dialog{
    width: 400px;
    height: 250px;
    background-color: rgba(255,255, 255, 0.8);
    margin: 50px 0;/*外边框*/
    border-radius: 20px;
}
.login-dialog h3{
   padding-top: 40px;
    text-align: center;
}
.login-dialog .row{
    padding: 10px 0;
    height: 50px;
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
}
.login-dialog .row span{
display: block;
width: 80px;
font-size: 700;
margin-top: 20px;
}
#username ,#password{
    width: 200px;
    height: 25px;
    line-height: 40px;
    font-size: 15px;
    padding-left: 10px;/*字体左移10 px*/
    outline: none;
}
.row #submit{
    width: 280px;
    height: 40px;
    background-color: orange;
    color: #fff;
    outline: none;
    border: none;
    font-size: large;
    margin-top: 30px;
}
.row button:active{
    background-color: #666;
}
 .ret a{
    /*变成块级元素*/
    display: block;
   margin-top: 40px;
   text-decoration: none;/*去掉下划线*/
   color: #666;
   font-weight: 500;
   margin-left: 10px;
}